The 630 area code covers the western suburbs of Chicago, Illinois. Aurora, Naperville, Wheaton and Downers Grove are all in it. It shares the area with the 331 area code.
Here are the counties and cities in 630, the time zone, the history and tips for unknown 630 calls.
630 Area Code Quick Facts
| State | Illinois |
| Location | Western suburbs of Chicago, including Aurora and Naperville |
| Time zone | Central Time (UTC-6, UTC-5 during daylight saving time) |
| In service since | August 3, 1996 |
| Type | Geographic area code |
| Shares its area with | 331 (overlay since October 7, 2007) |
| Toll-free? | No, it is a regular geographic area code |
Check any other code with our free area code lookup tool.
Where Is the 630 Area Code Located?
Area code 630 is located west of the city of Chicago. It covers most of DuPage County and parts of Kane, Will, Kendall and Cook counties. Main cities:
- Aurora
- Naperville
- Bolingbrook
- Downers Grove
- Wheaton
- Carol Stream
Chicago itself uses 312, 773 and 872.
What Time Zone Is the 630 Area Code In?
Naperville is on Central Time.
- Central Standard Time (CST), UTC-6, in winter
- Central Daylight Time (CDT), UTC-5, from mid March to early November
That puts it one hour behind New York and two hours ahead of Los Angeles. A quick time check saves you from calling someone at dinner or before breakfast.
History of the 630 Area Code
- 1947: the whole Chicago area is in 312.
- 1989: the suburbs are split off as 708, and 312 is kept for the city.
- August 3, 1996: 708 is divided three ways. The western suburbs become 630, the northern suburbs become 847, and the southern suburbs keep 708.
- October 7, 2007: 331 begins to overlay 630, and ten-digit dialing becomes mandatory.
A Map of Chicago-Area Codes
Chicago’s codes work like a compass. 312 is downtown. 773 is the rest of the city. 847 and 224 are the north and northwest suburbs. 630 and 331 are the west. 708 and 464 are the south. Further out, 815 and 779 cover Joliet, Rockford and the outer ring. Knowing this makes it easy to tell roughly where a Chicago-area caller is based.
How to Dial a 630 Number
Local calls in this area are dialed with the area code included.
- From the US or Canada: 1 + 630 + the seven-digit number
- From another country: your exit code + 1 + 630 + the seven-digit number
Is a Call From 630 a Scam?
A 630 number usually belongs to a household or business in DuPage County or nearby. The area has many corporate offices, research labs and distribution centers, so recruiters and delivery services call from it regularly.
Watch for these warning signs:
- Fake bank or card fraud alerts that ask for your PIN or passcode
- Calls about Medicare, health insurance or a car warranty you never asked about
- Messages that claim a family member is in trouble and needs money
- Pressure to stay on the line and act right now
Caller ID can be spoofed, so the number on your screen does not prove where a call comes from.
What to do with an unknown 630 call
- Hang up as soon as a call feels wrong. You do not owe a stranger an explanation.
- Verify the caller through an official number, not the one they give you.
- Block the number.
- Report scam calls at reportfraud.ftc.gov and register at donotcall.gov.
- Forward spam texts to 7726 (SPAM).
How to Get a 630 Phone Number
You do not have to live in Naperville to use a 630 number.
- Carriers: new lines in the western suburbs receive 630 or 331 depending on supply.
- VoIP and virtual number providers: search by area code, pick a 630 number and forward calls to any phone.
- Toll-free numbers: a better fit if your customers are spread across the country.
Read our guides to virtual phone numbers and the 800 area code.
Area Codes Near 630
| 331 | Same area as 630 |
| 312, 773, 872 | City of Chicago |
| 847, 224 | Northern and northwestern suburbs |
| 708, 464 | Southern suburbs |
| 815, 779 | Joliet, Rockford |
Related guides: 314 area code for St. Louis, 317 area code for Indianapolis, 214 area code for Dallas.
630 Area Code FAQs
What city is area code 630?
Aurora and Naperville are the largest. Wheaton, Downers Grove and Bolingbrook are also in 630.
Is 630 Chicago?
It is the western suburbs of Chicago, not the city itself.
What is area code 331?
It is the overlay for the 630 area and has been in service since October 7, 2007.
What time zone is 630?
Central Time.
Is 630 a toll-free number?
No. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.
Final Word
The 630 area code covers Chicago’s western suburbs on Central Time. It has been in service since 1996 and shares its area with 331. Let unknown callers leave a message first.
